[libpicofe.git] / gl.c

#include <stdio.h>
#include <stdlib.h>

#include <EGL/egl.h>
#include <GLES/gl.h>
#include "gl_platform.h"
#include "gl.h"

static EGLDisplay edpy;
static EGLSurface esfc;
static EGLContext ectxt;

/* for external flips */
void *gl_es_display;
void *gl_es_surface;

static int gl_have_error(const char *name)
{
	GLenum e = glGetError();
	if (e != GL_NO_ERROR) {
		fprintf(stderr, "GL error: %s %x\n", name, e);
		return 1;
	}
	return 0;
}

static int gles_have_error(const char *name)
{
	EGLint e = eglGetError();
	if (e != EGL_SUCCESS) {
		fprintf(stderr, "%s %x\n", name, e);
		return 1;
	}
	return 0;
}

int gl_init(void *display, void *window, int *quirks)
{
	EGLConfig ecfg = NULL;
	GLuint texture_name = 0;
	void *tmp_texture_mem = NULL;
	EGLint num_config;
	int retval = -1;
	int ret;
	EGLint attr[] =
	{
		EGL_NONE
	};

	ret = gl_platform_init(&display, &window, quirks);
	if (ret != 0) {
		fprintf(stderr, "gl_platform_init failed with %d\n", ret);
		goto out;
	}

	tmp_texture_mem = calloc(1, 1024 * 512 * 2);
	if (tmp_texture_mem == NULL) {
		fprintf(stderr, "OOM\n");
		goto out;
	}

	edpy = eglGetDisplay((EGLNativeDisplayType)display);
	if (edpy == EGL_NO_DISPLAY) {
		fprintf(stderr, "Failed to get EGL display\n");
		goto out;
	}

	if (!eglInitialize(edpy, NULL, NULL)) {
		fprintf(stderr, "Failed to initialize EGL\n");
		goto out;
	}

	if (!eglChooseConfig(edpy, attr, &ecfg, 1, &num_config)) {
		fprintf(stderr, "Failed to choose config (%x)\n", eglGetError());
		goto out;
	}

	if (ecfg == NULL || num_config == 0) {
		fprintf(stderr, "No EGL configs available\n");
		goto out;
	}

	esfc = eglCreateWindowSurface(edpy, ecfg,
		(EGLNativeWindowType)window, NULL);
	if (esfc == EGL_NO_SURFACE) {
		fprintf(stderr, "Unable to create EGL surface (%x)\n",
			eglGetError());
		goto out;
	}

	ectxt = eglCreateContext(edpy, ecfg, EGL_NO_CONTEXT, NULL);
	if (ectxt == EGL_NO_CONTEXT) {
		fprintf(stderr, "Unable to create EGL context (%x)\n",
			eglGetError());
		goto out;
	}

	eglMakeCurrent(edpy, esfc, esfc, ectxt);

	glEnable(GL_TEXTURE_2D);

	glGenTextures(1, &texture_name);

	glBindTexture(GL_TEXTURE_2D, texture_name);

	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 1024, 512, 0, GL_RGB,
		GL_UNSIGNED_SHORT_5_6_5, tmp_texture_mem);
	if (gl_have_error("glTexImage2D"))
		goto out;

	// no mipmaps
	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

	//glViewport(0, 0, 512, 512);
	glLoadIdentity();
	glFrontFace(GL_CW);
	glEnable(GL_CULL_FACE);

	glEnableClientState(GL_TEXTURE_COORD_ARRAY);
	glEnableClientState(GL_VERTEX_ARRAY);

	if (gl_have_error("init"))
		goto out;

	gl_es_display = (void *)edpy;
	gl_es_surface = (void *)esfc;
	retval = 0;
out:
	free(tmp_texture_mem);
	return retval;
}

static float vertices[] = {
	-1.0f,  1.0f,  0.0f, // 0    0  1
	 1.0f,  1.0f,  0.0f, // 1  ^
	-1.0f, -1.0f,  0.0f, // 2  | 2  3
	 1.0f, -1.0f,  0.0f, // 3  +-->
};

static float texture[] = {
	0.0f, 0.0f, // we flip this:
	1.0f, 0.0f, // v^
	0.0f, 1.0f, //  |  u
	1.0f, 1.0f, //  +-->
};

int gl_flip(const void *fb, int w, int h)
{
	static int old_w, old_h;

	if (fb != NULL) {
		if (w != old_w || h != old_h) {
			float f_w = (float)w / 1024.0f;
			float f_h = (float)h / 512.0f;
			texture[1*2 + 0] = f_w;
			texture[2*2 + 1] = f_h;
			texture[3*2 + 0] = f_w;
			texture[3*2 + 1] = f_h;
			old_w = w;
			old_h = h;
		}

		glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, w, h,
			GL_RGB, GL_UNSIGNED_SHORT_5_6_5, fb);
		if (gl_have_error("glTexSubImage2D"))
			return -1;
	}

	glVertexPointer(3, GL_FLOAT, 0, vertices);
	glTexCoordPointer(2, GL_FLOAT, 0, texture);
	glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);

	if (gl_have_error("glDrawArrays"))
		return -1;

	eglSwapBuffers(edpy, esfc);
	if (gles_have_error("eglSwapBuffers"))
		return -1;

	return 0;
}

void gl_finish(void)
{
	eglMakeCurrent(edpy, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
	eglDestroyContext(edpy, ectxt);
	ectxt = EGL_NO_CONTEXT;
	eglDestroySurface(edpy, esfc);
	esfc = EGL_NO_SURFACE;
	eglTerminate(edpy);
	edpy = EGL_NO_DISPLAY;

	gl_es_display = (void *)edpy;
	gl_es_surface = (void *)esfc;

	gl_platform_finish();
}
Commit	Line	Data
b9801854	1	#include <stdio.h>
	2	#include <stdlib.h>
	3
	4	#include <EGL/egl.h>
	5	#include <GLES/gl.h>
0d645bc5	6	#include "gl_platform.h"
b9801854	7	#include "gl.h"
	8
	9	static EGLDisplay edpy;
	10	static EGLSurface esfc;
	11	static EGLContext ectxt;
	12
6fd09356	13	/* for external flips */
	14	void *gl_es_display;
	15	void *gl_es_surface;
	16
b9801854	17	static int gl_have_error(const char *name)
	18	{
	19	GLenum e = glGetError();
	20	if (e != GL_NO_ERROR) {
	21	fprintf(stderr, "GL error: %s %x\n", name, e);
	22	return 1;
	23	}
	24	return 0;
	25	}
	26
	27	static int gles_have_error(const char *name)
	28	{
	29	EGLint e = eglGetError();
	30	if (e != EGL_SUCCESS) {
	31	fprintf(stderr, "%s %x\n", name, e);
	32	return 1;
	33	}
	34	return 0;
	35	}
	36
0d645bc5	37	int gl_init(void display, void window, int *quirks)
b9801854	38	{
	39	EGLConfig ecfg = NULL;
	40	GLuint texture_name = 0;
	41	void *tmp_texture_mem = NULL;
	42	EGLint num_config;
	43	int retval = -1;
	44	int ret;
	45	EGLint attr[] =
	46	{
	47	EGL_NONE
	48	};
	49
0d645bc5	50	ret = gl_platform_init(&display, &window, quirks);
	51	if (ret != 0) {
	52	fprintf(stderr, "gl_platform_init failed with %d\n", ret);
	53	goto out;
	54	}
	55
b9801854	56	tmp_texture_mem = calloc(1, 1024 * 512 * 2);
	57	if (tmp_texture_mem == NULL) {
	58	fprintf(stderr, "OOM\n");
	59	goto out;
	60	}
	61
	62	edpy = eglGetDisplay((EGLNativeDisplayType)display);
	63	if (edpy == EGL_NO_DISPLAY) {
	64	fprintf(stderr, "Failed to get EGL display\n");
	65	goto out;
	66	}
	67
	68	if (!eglInitialize(edpy, NULL, NULL)) {
	69	fprintf(stderr, "Failed to initialize EGL\n");
	70	goto out;
	71	}
	72
	73	if (!eglChooseConfig(edpy, attr, &ecfg, 1, &num_config)) {
	74	fprintf(stderr, "Failed to choose config (%x)\n", eglGetError());
	75	goto out;
	76	}
	77
	78	if (ecfg == NULL \|\| num_config == 0) {
	79	fprintf(stderr, "No EGL configs available\n");
	80	goto out;
	81	}
	82
	83	esfc = eglCreateWindowSurface(edpy, ecfg,
	84	(EGLNativeWindowType)window, NULL);
	85	if (esfc == EGL_NO_SURFACE) {
	86	fprintf(stderr, "Unable to create EGL surface (%x)\n",
	87	eglGetError());
	88	goto out;
	89	}
	90
	91	ectxt = eglCreateContext(edpy, ecfg, EGL_NO_CONTEXT, NULL);
	92	if (ectxt == EGL_NO_CONTEXT) {
	93	fprintf(stderr, "Unable to create EGL context (%x)\n",
	94	eglGetError());
	95	goto out;
	96	}
	97
	98	eglMakeCurrent(edpy, esfc, esfc, ectxt);
	99
	100	glEnable(GL_TEXTURE_2D);
	101
	102	glGenTextures(1, &texture_name);
	103
	104	glBindTexture(GL_TEXTURE_2D, texture_name);
	105
	106	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 1024, 512, 0, GL_RGB,
	107	GL_UNSIGNED_SHORT_5_6_5, tmp_texture_mem);
	108	if (gl_have_error("glTexImage2D"))
	109	goto out;
	110
	111	// no mipmaps
	112	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
	113	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
	114
	115	//glViewport(0, 0, 512, 512);
	116	glLoadIdentity();
	117	glFrontFace(GL_CW);
	118	glEnable(GL_CULL_FACE);
	119
120	glEnableClientState(GL_TEXTURE_COORD_ARRAY);
121	glEnableClientState(GL_VERTEX_ARRAY);
122
123	if (gl_have_error("init"))
124	goto out;
125
6fd09356	126	gl_es_display = (void *)edpy;
6fd09356	127	gl_es_surface = (void *)esfc;
b9801854	128	retval = 0;
	129	out:
	130	free(tmp_texture_mem);
	131	return retval;
	132	}
	133
	134	static float vertices[] = {
	135	-1.0f, 1.0f, 0.0f, // 0 0 1
	136	1.0f, 1.0f, 0.0f, // 1 ^
	137	-1.0f, -1.0f, 0.0f, // 2 \| 2 3
	138	1.0f, -1.0f, 0.0f, // 3 +-->
	139	};
	140
	141	static float texture[] = {
	142	0.0f, 0.0f, // we flip this:
	143	1.0f, 0.0f, // v^
	144	0.0f, 1.0f, // \| u
	145	1.0f, 1.0f, // +-->
	146	};
	147
	148	int gl_flip(const void *fb, int w, int h)
	149	{
	150	static int old_w, old_h;
	151
e54719ef	152	if (fb != NULL) {
	153	if (w != old_w \|\| h != old_h) {
	154	float f_w = (float)w / 1024.0f;
	155	float f_h = (float)h / 512.0f;
	156	texture[1*2 + 0] = f_w;
	157	texture[2*2 + 1] = f_h;
	158	texture[3*2 + 0] = f_w;
	159	texture[3*2 + 1] = f_h;
	160	old_w = w;
	161	old_h = h;
	162	}
	163
	164	glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, w, h,
	165	GL_RGB, GL_UNSIGNED_SHORT_5_6_5, fb);
	166	if (gl_have_error("glTexSubImage2D"))
	167	return -1;
b9801854	168	}
b9801854	169
b9801854	170	glVertexPointer(3, GL_FLOAT, 0, vertices);
	171	glTexCoordPointer(2, GL_FLOAT, 0, texture);
	172	glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
	173
	174	if (gl_have_error("glDrawArrays"))
	175	return -1;
	176
	177	eglSwapBuffers(edpy, esfc);
	178	if (gles_have_error("eglSwapBuffers"))
	179	return -1;
	180
	181	return 0;
	182	}
	183
	184	void gl_finish(void)
	185	{
	186	eglMakeCurrent(edpy, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
	187	eglDestroyContext(edpy, ectxt);
	188	ectxt = EGL_NO_CONTEXT;
	189	eglDestroySurface(edpy, esfc);
	190	esfc = EGL_NO_SURFACE;
	191	eglTerminate(edpy);
	192	edpy = EGL_NO_DISPLAY;
0d645bc5	193
6fd09356	194	gl_es_display = (void *)edpy;
	195	gl_es_surface = (void *)esfc;
	196
0d645bc5	197	gl_platform_finish();
b9801854	198	}